https://doi.org/10.1140/epjst/e2008-00779-6
Measurement of transversity signals in two hadron production at COMPASS
1
Helmholtz-Institut fuer Strahlen- und Kernphysik,
Universitaet Bonn, Nussallee 14-16, 53115 Bonn, Germany
Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
The quark structure of the nucleon at the twist two level
can be completely described with three quark distribution functions:
the spin averaged distribution function q(x), the helicity
distribution 
and the transverse spin distribution
. This last function, referred to as
transversity, is chiral-odd and can only be measured in combination
with another chiral-odd function. COMPASS is a fixed target
experiment at the CERN SPS M2 beamline. Its target
(
) can be both longitudinally and transversely
polarized with respect to the polarized 160 GeV/c 
-beam. In
transverse configuration can be
measured in semi-inclusive deep-inelastic scattering (SIDIS),
requiring the detection of hadronic products. A rather new probe of
the transverse spin distribution function is
the measurement of two hadron production, introducing the chiral odd
interference fragmentation function
. Results are presented for
the years 2003–2004 including particle identification by using the
information of the RICH detector. The analysis was performed using
all positive/negative charged pairs and z-ordered pairs.
© EDP Sciences, Springer-Verlag, 2008
